I discovered this as a facebook game a year ago.
I loved it despite its uncut-feeling, and still do!
The great thing about this is that its beautifully simple, yet has room for lots of different tactics to be tested hundreds of times! THAT is why this is addictive!
It's a game that's got all the fundamentals it needs for me to easily forgive the seemingly-rushed finish. In fact, I love it all the more for that; it makes me feel like I'm playing an alpha for something even better to come.....?
Survival; addictive; and competitive if playing against friends for high-scores.